Basic Electrical Engineering: Part-5 Objective Questions

Solved Objective Questions From Basic Electrical Engineering:

[1] The wire is stretched to double its length, then its resistance R will become
(a) R/2

(b) 4R
(c) 2R
(d) R/4

Ans: B

[2] The power drawn by the circuit whose input is 20KVA and p.f is 0.8 lagging

(a) 12
(b) 20
(c) 16
(d) 8

Ans: C

[3] The combined resistance of two equal resistors connected in parallel is equal to

(a) One half the resistance of one resistor
(b) Twice the resistance of one resistor
(c) Four times the resistance of one resistor
(d) One fourth the resistance of one resistor

Ans: A

[4] The superposition theorem is applicable to circuits only having ............ elements
(a) Non-linear
(b) Passive
(c) Resistive
(d) Linear bilateral

Ans:D

[5] The Q-factor of a coil is given by
(a) Its power factor
(b) Ratio of max. energy stored & energy dissipated per cycle.
(c) Reciprocal of its power factor
(d) Ratio R/Z

Ans:C

[6] The power factor at resonance in RLC circuit is

(a) Zero
(b) Unity
(c) 0.5 lagging
(d) 0.5 leading

Ans:B

[7] Cells are connected in parallel to

(a) Increase the available voltage
(b) Reduce the cost of wiring
(c) Increase the available current
(d) Reduce the time required to fully charge them after use

Ans: C

[8] The  power factor of a purely resistive circuit is
(a) Zero
(b) Unity
(c) Lagging
(d) Leading

Ans: B

[9] Which of the following has minimum running cost?

(a) Hydro electric station
(b) Nuclear power station
(c) Thermal power station
(d) Diesel power station

Ans:A

[10] The color code of a resistor 2.7Kohm with the tolerance of 10% is

(a) Red, violet, red and silver
(b) Red, violet, yellow and gold
(c) Red, violet, orange, silver
(d) Red, violet, red, gold

Ans:A